This update for SDL_image fixes the following issues:

Update SDL_Image to new snapshot 1.2.12+hg695.

Security issues fixed:

* TALOS-2019-0821 CVE-2019-5052: exploitable integer overflow vulnerability when loading a PCX file (boo#1140421)
* TALOS-2019-0841 CVE-2019-5057: code execution vulnerability in the PCX image-rendering functionality of SDL2_image (boo#1143763)
* TALOS-2019-0842 CVE-2019-5058: heap overflow in XCF image rendering can lead to code execution (boo#1143764)
* TALOS-2019-0843 CVE-2019-5059: heap overflow in XPM image handling (boo#1143766)
* TALOS-2019-0844 CVE-2019-5060: integer overflow in the XPM image (boo#1143768)
* CVE-2019-7635: heap-based buffer over-read in Blit1to4 in video/SDL_blit_1.c (boo#1124827)
* CVE-2019-13616: fix heap buffer overflow when reading a crafted bmp file (boo#1141844).

This update was imported from the openSUSE:Leap:15.0:Update update project.